To the  champion coated



Jan. 10, 1928. 1,655,745

I L. G. THOMSON I comm) PAPER Filed Sept. 26, 1924 //VVf/V7 0/?,'

ATTO/PNZFVJ Patented Jan. 10,1928.

LOGAN G. THOMSON, OF CINCINNATI, OHIO, ASSIGNOR TO THE CHAMPION COATED PAPER GOIVIPANY, OF HAMILTON, 01-110, A. CORPORATION OF OHIO.

COATED PA?ER.

Application filed September 26, 1824. Serial No. M0911.

My invention relates to the productionpf a coated book paper sheet in which the finish is dull.

In the production of super-calendered coated book paper the proper processing thereof to get a finish which is smooth, and suitable for taking halt tone impressions, it has always been found necessaryto use a coating and super-calender it to high or glossy finish. here rough ingredients have been used, or insuiiicient calendering resorted to, the finish has not been proper for the highest grade of printing.

The eifort to add a coating to the glossy finish of a book paper is not practical. where the usual coating processes are followed. since coatings are aqueous in nature.

I have discovered. however. that I can add a very fine dull finish coating by applying it onto the paper'in a solid shade of the color desired, using an oil base ink, for example, without affecting the smoothness of the finish, or developing any roughness or lack of uniformity of surface which detracts from the ability of the paper take fine halt tone printing.

Thus instead of proceeding, as has been attempted in the prior art. to cut down on the supencalendering which is a risky procedure, and far out of line with ordinary manufacturing economy, I give the desired finish to the paper in the first place. and then add the final dull. finish surface in a very fine film as can be done by applying it onto the paper while still in the roll.

Also I avoid any resort, as has been also attempted, to coarse. gritty coatings. thus avoiding a roughness or grittiness of surface, which gives unsatisfactory results.

I accomplish my objects by that certain procedure, and product to be hereinafter more specifically pointed out and claimed.

The drawing is a diagrammatic view of the machine for carrying on my process.

I proceed first to produce a regular supercalendered coated book paper. The roll of paper 1 is supposed to show a roll of such paper rewound from the super-calenders.

My process is practical for the paper manufacturer as it is capable of being used in the roll. before same is cut up into sheets, thereby efiecting economy in operation.

' calender-ed T have shown as a typical machine for printing up the paper, a set of cylinders 2,

'which are plain cylinders, and two sets of inking rollers 3 and 4, which derive their ink from troughs 5 and 6. The roll of paper is passed between the cylinders, and the inking rolls apply to the cylinders a fine film of a desired color of ink. I find that inks having a dull finish can readily be obtained, and I find it preferable to employ inks which are made with an oil base and do not affect the super-calendered coating on the paper, as far as smooth printing surface is concerned. 7 I

From the finish coating operation the paper is dried in festoons 7 or by hot blasts. as'indicated at 9, or some other means of drying, and thence it may pass to the cutting; machine 8. which severs the web into sheets. same being the usual form of shipment for coated book pap-er. The paper could be rolled up again, however, if this appears to be desirable.

The process in the absence of special dryers could be used to coat only one side of ,the paper at a time, as is evident. and it will be preferable to form the printed coating so as to leave a small uncoated or unprinted edge on the paper. This is to avoid the balling up of the ink at the points along the edges of the paper. I

The use of paper as it comes from the super-calenders which has to be trimmed anyhow at the edges, avoids loss of paper by the use of my process. since this edge which has to be removed in trimming the resultant sheets, will be: used as the protective or unprinted edge.

Having thus described my i nvention, what I claim as new and desire to secure by Let ters Patent. is v 1. A dull finish paper comprising a lf)0(lv of paper having a super-calendered coating thereon, anda subsequently applied dull fin ish coating upon the super-calendered coating.

2. A dull finish, coated and super-calendered paper comprising a body of paper having a super-calendered coating thereon. and a dull finish coating upon the super coating, formed by an ink.

said coating being 3. A process of forming book paper, which consists in coating the sheet, super-calendel'ing it, and subsequent to the super-calendering, imposing thereon a thin fihn of ink.

Jr. A process of forming book paper, which consists in passing a super-calend-ered web of paper from a roll bet-Ween coating cylinders which are covered with a film of ink disposed 1n such a thin fihn as to only dull the calendered surface, leaving an edge uncoated by said cylinders, and subsequentlytrimming said edge from the paper.

LOGAN G. THOMSON. 

